Final answer:
The Davis Bacon Act option (a)is the federal law that introduced the concept of the prevailing wage, ensuring that laborers on federal construction projects are paid local prevailing wages.
Step-by-step explanation:
The federal law that introduced the concept of the prevailing wage is the Davis Bacon Act. This act, established in 1931, requires that local prevailing wages be paid to various classes of laborers and mechanics working on federally funded or assisted construction projects.
The purpose of the Davis Bacon Act is to prevent nonlocal contractors from underbidding local wage levels. In contrast, the Walsh Healy Act, the Fair Labor Standards Act, and USERRA deal with other aspects of labor law.
For example, the Fair Labor Standards Act sets minimum wage, and maximum working hours, and prohibits certain types of child labor, without specifically addressing the concept of prevailing wage.